Hi,
With it's cyclic outbreaks, this could be due to hormonal changes in your body. Aside from hormonal changess during mentruation, the following have been found to make acne worse: oil-based makeup, suntan oil and hair products, stress, squeezing or picking at blemishes and hard scrubbing of the skin.
It is important to clean your face everyday and avoid harsh chemicals. Over-the-counter acne medications may also help. There are plenty of people with the same situation you are in. Relax and do not stress yourself too much.
Take care and keep us posted.
There is helpful information on geocities.com/dhr6878 which is a possibility of what you may have
I too have the same problem that has only just begun 4 months ago.
My whole face is covered in a rash with small white heads underneath.
I am 49 years old and am devastated for 10 days a month with this condition. I am going to the doctor to get some advice. Don't think
he'll know any better